Segment Reporting - Net Revenues, Expenses and Total Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017	Nov. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 822,557	$ 779,294	$ 1,643,803	$ 1,574,807
Non-interest expenses	700,692	663,113	1,399,200	1,334,427
Earnings before income taxes	121,865	116,181	244,603	240,380
Segment assets	41,123,471		41,123,471		$ 39,705,691
Capital Markets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	805,300	778,600	1,617,700	1,561,200
Non-interest expenses	688,300	651,700	1,371,600	1,308,400
Earnings before income taxes	117,000	126,900	246,100	252,800
Segment assets	39,993,500		39,993,500		38,620,400
Asset Management
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	17,300	700	26,100	13,600
Non-interest expenses	12,400	11,400	27,600	26,000
Earnings before income taxes	4,900	$ (10,700)	(1,500)	$ (12,400)
Segment assets	$ 1,130,000		$ 1,130,000		$ 1,085,300